1、Efficient Anti Theft: The door and window anti theft alarm can accurately detect the door and window switch status, can immediately trigger a strong alarm sound, effectively prevent intruders from entering. 2、Easy to Use: The installation of the security door alarm is simple and convenient, without complex tools or operations, just paste the alarm on the door and window, can also be remotely controlled, easy for the user to turn the alarm on or off. 3、Various Use: The door alarm sensor is suitable for all types of doors and windows, including wooden, iron and plastic doors and windows, can also be used in different places such as homes, hotels, shops, offices, etc. 4、Low Energy Consumption: The wireless door alarm is designed with low power consumption to provide a long service life, having a long battery life, not needing to replace the battery frequently, saving time and effort. 5、Departure Protection: The window alarm can also be used as departure protection equipment, setting it to activity detection mode when you leave your home or office, and as soon as someone approaches, it will trigger an alarm to alert you that someone has entered the area. Item Type: Door Window Alarm Material: ABS Alarm Battery: 4Pcs AA Lithium Battery (Shipped Without Battery) Remote Control Battery: 2032 Button Cell Capacity: 200mAh (Shipped With Built In Battery 1 x Door Window Alarm 2 x Remote Control 1 x Bracket